CVE-2020-14966

An issue was discovered in the jsrsasign package through 8.0.18 for Node.js. It allows a malleability in ECDSA signatures by not checking overflows in the length of a sequence and '0' characters appended or prepended to an integer. The modified signatures are verified as valid. This could have a security-relevant impact if an application relied on a single canonical signature.

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v2.0 NVD

5.0 MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:N

EPSS

1.12% chance of exploitation in the next 30 days, 66th percentile

Published

2020-06-22

Updated

2024-08-04

Proof-of-concept exploits (1)

• kjur/jsrsasign/issues/4373370★ · 2026-08-19

Security advisories

• https://kjur.github.io/jsrsasign
• https://security.netapp.com/advisory/ntap-20200724-0001
• https://www.npmjs.com/package/jsrsasign
• advisories/GHSA-p8c3-7rj8-q963

References

• CVE Record
• NVD entry

Related

• CVE-2020-14967
• CVE-2020-14968